How many bits does EXP occupy in the MPLS label header?()A、8B、4C、3D、1E、2

题目

How many bits does EXP occupy in the MPLS label header?()

  • A、8
  • B、4
  • C、3
  • D、1
  • E、2

相似考题
更多“How many bits does EXP occupy in the MPLS label header?()A、8B、4C、3D、1E、2”相关问题
  • 第1题:

    Which two QoS classification and marking statements are true?()

    • A、 In a Frame Relay network, delay sensitive traffic is tagged with the discard eligible (DE) bit.
    • B、 In an MPLS network, the three most significant bits of the DSCP or the IP precedence of the IP packet are copied into the MPLS EXP field
    • C、 In an MPLS network, the MPLS EXP bits are used to identify up to 16 CoS values.
    • D、 The differentiated services code point (DSCP) field consists of the first three bits of the IP precedence field in the header of an IP packet.
    • E、 The 802.10 standard uses a three bitfield referred to as the user priority bits (PRI) to mark packets as belonging to a specific CoS.

    正确答案:B,E

  • 第2题:

    In a frame ,the MPLS label is imposed().

    • A、After the Layer3 header and before Layer2 header
    • B、After the Layer2 header and before Layer3 header
    • C、Within the Layer 3 header
    • D、Before the layer 2 header

    正确答案:B

  • 第3题:

    Which statement correctly describes the disabling of IP TTL propagation in an MPLS network?()

    • A、The TTL field from the IP packet is copied into the TTL field of the MPLS label header at the ingress edge LSR
    • B、TTL propagation cannot be disabled in an MPLS domain
    • C、TTL propagation is only disabled on the ingress edge LSR
    • D、The TTL field of the MPLS label header is set to 255
    • E、The TTL field of the IP packet is set to 0

    正确答案:D

  • 第4题:

    Where is the MPLS label imposed?()

    • A、after the Layer 3 header and before the Layer 2 payload
    • B、after the Layer 3 header and before the Layer 4 payload
    • C、after the Layer 2 header and before the Layer 1 payload
    • D、after the Layer 1 header and before the Layer 2 payload
    • E、after the Layer 2 header and before the Layer 3 payload

    正确答案:E

  • 第5题:

    How many bits are contained in each field of an IPv6 address?()

    • A、24
    • B、4
    • C、8
    • D、16

    正确答案:D

  • 第6题:

    Which of the following is true about the MPLS header and its EXP field size?()

    • A、The MPLS header is 2 bytes,and the EXP field is 3 bits long.
    • B、The MPLS header is 1 byte,and the EXP field is 3 bits long.
    • C、The MPLS header is 4 bytes,and the EXP field is 3 bits long.
    • D、The MPLS header is 3 bytes,and the EXP field is 3 bits long.

    正确答案:C

  • 第7题:

    An ERX Edge Router is operating in an MPLS network using interface label space.What is used to make a forwarding decision?()

    • A、EXP bits
    • B、VPI / VCI
    • C、shim header
    • D、SNAP header

    正确答案:B

  • 第8题:

    多选题
    Which four of these are MPLS label header fields? ()
    A

    Label

    B

    VPI VCI

    C

    EXP

    D

    TTL

    E

    FCS

    F

    S flag


    正确答案: C,A
    解析: 暂无解析

  • 第9题:

    单选题
    How many bits does EXP occupy in the MPLS label header?()
    A

    8

    B

    4

    C

    3

    D

    1

    E

    2


    正确答案: E
    解析: 暂无解析

  • 第10题:

    单选题
    In the context of MPLS,what is the correct action to be performed when an aggregate label is received ?()
    A

    It adds the VPN label into the top label in the MPLS label stack

    B

    It replaces the top label in the MPLS label stack with a VPN label and propagates

    C

    It replaces the bottom label in the MPLS label stack with a VPN label and propagates

    D

    It removes the top label in the MPLS label stack and does a Layer 3 lookup on underlying IP packets

    E

    None of above


    正确答案: D
    解析: 暂无解析

  • 第11题:

    单选题
    A router receives a packet from a neighbor with an MPLS shim header value of 0.What does the router do with this packet?()
    A

    It performs a label pop operation and an IP lookup.

    B

    It performs a label swap operation and an IP lookup.

    C

    It sends an error message toward the egress router.

    D

    It sends an error message toward the ingress router.


    正确答案: C
    解析: 暂无解析

  • 第12题:

    单选题
    An ERX Edge Router is operating in an MPLS network using interface label space.What is used to make a forwarding decision?()
    A

    EXP bits

    B

    VPI / VCI

    C

    shim header

    D

    SNAP header


    正确答案: C
    解析: 暂无解析

  • 第13题:

    In the context of MPLS,what is the correct action to be performed when an aggregate label is received ?()

    • A、It adds the VPN label into the top label in the MPLS label stack
    • B、It replaces the top label in the MPLS label stack with a VPN label and propagates
    • C、It replaces the bottom label in the MPLS label stack with a VPN label and propagates
    • D、It removes the top label in the MPLS label stack and does a Layer 3 lookup on underlying IP packets
    • E、None of above

    正确答案:D

  • 第14题:

    A router receives a packet from a neighbor with an MPLS shim header value of 0.What does the router do with this packet?()

    • A、It performs a label pop operation and an IP lookup.
    • B、It performs a label swap operation and an IP lookup.
    • C、It sends an error message toward the egress router.
    • D、It sends an error message toward the ingress router.

    正确答案:A

  • 第15题:

    How many simultaneous Telnet sessions does a Cisco router support by default?()

    • A、1
    • B、2
    • C、3
    • D、4
    • E、5
    • F、6

    正确答案:E

  • 第16题:

    As a CCNA candidate,you must have a firm understanding of the IPv6 address structure.Refer to IPv6 address,could you tell me how many bits are included in each filed?()

    • A、24
    • B、4
    • C、3
    • D、16

    正确答案:D

  • 第17题:

    In Any Transport over MPLS (AtoM) Control word is an optional 4-byte field used in the pseudowire packet.The control word carries generic and Layer 2 payload-specific information to emulate L2 packets correctly.In pseudowire packet, where is this Control Word inserted?()

    • A、Inserted between the MPLS label stack and the Layer 3 payload
    • B、Inserted between the MPLS label stack and the Layer 3 Header
    • C、Inserted between the MPLS label stack and the Layer 2 payload
    • D、Inserted between the MPLS label stack and the Layer 2 header

    正确答案:C

  • 第18题:

    How many messages does Internet Key Exchange use to negotiate SA characteristics when it runs inaggressive mode?()

    • A、3
    • B、4
    • C、5
    • D、2
    • E、6

    正确答案:A

  • 第19题:

    单选题
    Which statement correctly describes the disabling of IP TTL propagation in an MPLS network?()
    A

    The TTL field from the IP packet is copied into the TTL field of the MPLS label header at the ingress edge LSR

    B

    TTL propagation cannot be disabled in an MPLS domain

    C

    TTL propagation is only disabled on the ingress edge LSR

    D

    The TTL field of the MPLS label header is set to 255

    E

    The TTL field of the IP packet is set to 0


    正确答案: D
    解析: 暂无解析

  • 第20题:

    多选题
    Which two QoS classification and marking statements are true? ()
    A

    In a Frame Relay network, delay sensitive traffic is tagged with the discard eligible (DE) bit.

    B

    In an MPLS network, the three most significant bits of the DSCP or the IP precedence of the IP packet are copied into the MPLS EXP field.

    C

    In an MPLS network, the MPLS EXP bits are used to identify up to 16 CoS values.

    D

    The differentiated services code point (DSCP) field consists of the first three bits of the IP precedence field in the header of an IP packet.

    E

    The 802.1Q standard uses a three bit field referred to as the user priority bits (PRI) to mark packets as belonging to a specific CoS.


    正确答案: B,D
    解析: 暂无解析

  • 第21题:

    单选题
    Where is the MPLS label imposed?()
    A

    after the Layer 3 header and before the Layer 2 payload

    B

    after the Layer 3 header and before the Layer 4 payload

    C

    after the Layer 2 header and before the Layer 1 payload

    D

    after the Layer 1 header and before the Layer 2 payload

    E

    after the Layer 2 header and before the Layer 3 payload


    正确答案: A
    解析: 暂无解析

  • 第22题:

    问答题
    How many bits represented in DSCP?

    正确答案: 6 bit
    解析: 暂无解析

  • 第23题:

    单选题
    Which of the following is true about the MPLS header and its EXP field size?()
    A

    The MPLS header is 2 bytes,and the EXP field is 3 bits long.

    B

    The MPLS header is 1 byte,and the EXP field is 3 bits long.

    C

    The MPLS header is 4 bytes,and the EXP field is 3 bits long.

    D

    The MPLS header is 3 bytes,and the EXP field is 3 bits long.


    正确答案: B
    解析: 暂无解析